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Rostock 2019 – scientific programme

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PV: Plenarvorträge

PV II

PV II: Plenary Talk

Monday, March 11, 2019, 09:00–09:45, U Audimax

Interstellar radionuclides identified in deep-sea archives — •Anton Wallner — Department of Nuclear Physics, The Australian National University, Canberra

The Interstellar Medium (ISM) is continuously fed with new nucleosynthetic products. The solar system moves through the ISM and collects dust particles. Therefore, direct detection of freshly produced nuclides on Earth provides insight into recent and nearby nucleosynthetic activities. ISM radionuclides trapped in deep-ocean archives include 60Fe (t1/2=2.6 Myr), 26Al (0.7 Myr) and 244Pu (81 Myr). These nuclides can be measured with Accelerator Mass Spectrometry (AMS) with high sensitivity.

Recent measurements, which continued pioneering work at TU Munich, demonstrate a global 60Fe influx and is evidence for exposure of Earth to recent (≤10 Myr) supernova explosions. Unknown is still the site where the heaviest elements are made in nature. Very low concentrations measured for interstellar 244Pu, however, disfavour supernovae as the predominant producing site for heavy-element nucleosynthesis.

I will present new results, measured for 60Fe at the ANU and for 244Pu at ANSTO with unprecedented sensitivity. These data provide new insights into their concomitant influx and their ISM concentrations over a time period of the last 11 Myr.

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